延迟存在时间越长，服务器1、2和3 就可能会随着应用程序服务器中越来越多的工作线程被阻塞而变得不可用。
The longer the delay persists, servers 1, 2, and 3 may become unavailable as more and more of the worker threads within the application servers become blocked.
没有单点故障问题：系统中不应该存在单点，就是说不能因为一个服务器的宕机或者故障而导致整个应用程序的不可用。
No single point of failure: there should be no one server which, if lost, causes downtime of the application.
memcached服务器不可用不应该是应用程序的终结，虽然这意味着在memcached服务器恢复正常之前性能会有所降低。
Losing your memcached server should not be the end of your application, although it might imply a decrease in performance until the memcached server comes back up.
为了监视一个非受管应用程序服务器（在基本安装中）或部署管理器，它则会使用 j2ee.state通知，因为 websphere.process 通知不可用。
To monitor an unmanaged application server (Base) or deployment manager, it uses the j2ee.state notifications because websphere.process
但是，如果身份验证服务器不可用，则事件处理程序会使应用程序重新恢复为脱机状态。
However, if the authentication server is unavailable, the event handler returns the application to the offline state.
您所尝试使用的该网页服务器上的网页应用程序当前不可用。请点击您网页浏览器上的刷新按钮，尝试再次请求。
The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.
您所尝试使用的该网页服务器上的网页应用程序当前不可用。请点击您网页浏览器上的刷新按钮，尝试再次请求。
The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.
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